Piston for deep-well pumps



Patented Jue Z5, 1895.

.(NoModel.)

D. B. S'IEVENSON.v

- PISTON FOR DEEP WELL PUMPS. No. 541,699.-

- @noem/cob 1n: {lonms PETERS co1, ramo-uws.. WASHING-rou, n. c.

@9i/imam@ UNITED STATES PATENT Grimes.

DAVID BOWLBY STEVENSON, 0F PETROLIA, PENNSYLVANIA.

PISTON FOR DEEP-WELI.l PUlVIPS.

snEcIFIcATIoN forming para of' Letters Patent No. 541,699, dated June25, 1895.

Applicant nea March 25, 1895.

To all whom it may concern,.-

Be it known that I, DAVID BowLBY STEVEN- SON, a citizen of the UnitedStates, residing at Petroliain the county of Butler and State ofPennsylvania, have invented a new and useful Improvement in Pistons forDeep-Well Pumps; and I do hereby declare the following to be a full,clear, and exact description of the same, reference being had to theVaccompanying drawings, in which- Figure 1 represents myv pump-plungerin longitudinal vertical section. Fig. 2 is a horizontal section at line:c of Fig. 1, and Fig. 3 is a horizontal section at line 'LL/of Fig. 1.

This invention relates in general to pumps for deep wells and moreparticularly to improvements in the piston of the pump which is thesubject of a former patent No. 529,209 to myself. In using that pump Idiscovered the necessity of something to keep the rivets which fall intoit from being repeatedlythrown up by the oil when pumping, and wearingor stopping the pump. I also found that the barrel ot the piston whenscrewed together in sections, particularly below the valve, would bejarred loose and be lost off, and the object of the present invention isto overcome those objectionable features.-

To this end my invention consists in the construction and combination ofparts forming a piston for deep well pumps hereinafter described andclaimed reference being had to the accompanying drawings, in which- 5represents the barrel of the piston made in a single piece from thescrew pin 6, by means of which it is to be connected to the piston rod,to the lower end 7 against which the shoulder 8 of the point plug 9rests. This point plug is of a size, below its shoulder 8 tov nearlyiill the pump barrel and is reduced and screw threaded at its neck l0 tolit into the threaded lower end of the piston barrel 5'.

l1 is a ring made of any suitable material to be turned with-a trueflange 12 to fit be` tween and be tightlyheld by the point plug 9 andthe barrel, and with a valve seat on each face for the ball valve 13 torest on one side at a time. I/Vhen this seat becomes worn on the upperside so as to be of no further service the ring may be inverted and theunder side becomes the valve seat, as good as a new ring.

The plug 9 is hollow and has perfor-ations 14 serial Nn. 543,097. (nomodem to admit the oil and yet to serve as a strainer to keep outgravel, &c. The barrel is'solid at its`pin end 6 and to a sufticientdistance below the shoulder 15 to insure strength and is bored from itslower'end making it hollow up to the point 16, 17 representing outletsat the sides for the escape of oil. The lower end of the barrel 5 isturned to tit freely in the pump barrel and is polygonal at 18 toreceivea screw wrench whereby the whole plunger may be screwed int-o theusual socket of a piston rod.

The plug 8 is a polygon in the region 19 to receive a screw wrench sothat by means of two wrenches the plug and piston barrel may be screwedfirmly together at lO. The body of the' piston is reduced to receive thepacking rings 20 of which there may be any suitable number, with loosesliding collars or rings`2l interposed, and a' follower ring 22 which isinternally screw threaded at 23. This follower is polygonal in theregion 24 to receive a wrench whereby it may be forcibly screwed downupon the cups and rings to hold them in place upon the shoulder 15. Thefollower 22 isf hollowed out at its upper end, leaving an annular cup 26around the reduced body or barrel 5 to serve as a rivet-catcher. It willbe seen'that this cup 26 is the full size of the plunger to fill thepump barrel so closely that rivets or gravel, if dropped into the pumpbarrel, cannot pass down between the plunger and'pump barrel. It willalso be seen that the discharge apertures 17 are above the rivet cup sothat oil being pumped will not pass through the cup but entirely aboveit, so that rivets 'when once caught in the cup will stay there untilthey are drawn out of the well with the plunger.

27 represents a check nut that may be screwed back up against the pistonrod socket to tighten its grip upon the plunger.

28 is an annular recess in the lower part of the cup and a little widerthan the depth of the screw thread 23 into which a packing ring 2E) ofleather or other soft material may be forced to keep sand out of thescrew joint.

The boreot the barrel 5 is enlarged at the lower end to serve as a cagefor the ball and recesses 29 between lugs projecting inward from abovethe wall of this cage permit the oil to pass up around the ball when thepiston being pushed down raises the ball; otherwise IOO the ball whenforced into the top of the cage by rising oil would serve as a valve tostop the passage of rising oil the same as it now stops the oil whichhas passed upward, from descending. This piston barrel being one piecefrom the piston rod down to and beyond the shoulder 15 cannot be partedso as to lose the packing cups and rings in the well. The annularcupbeing almost a close fit in the pump barrel is sure to catch anyfalling rivets, and being below the delivery aperture 17 these rivetscannot be tossed up by rising oil.4

Thus I avoid cloggingr the pump with rivets.

Having thus fully described my invention, what I believe to be new, anddesire to secure by Letters Patent, is the following:l

l. In pump pistons, a hollow piston barrel of a size at its lower end toloosely `fit the pump barrel and reduced along;1 its body and providedat its upper'end with an integral screw pin for attachment to a pistonrod and further provided with side discharge apertures near its upperend; a series of packing rings or cups mounted on the reduced portion ofthe barrel above a shoulder thereof; slide rings located between thesaid packing rings or cups 'and a follower nut screw threaded upon thcbody over the packing ring, substantially as described.

2. In pump pistons, a hollow piston barrel adapted to be secured to apiston rod and having side-delivery apertures near its upper end;packing rings upon the said piston barrel and a follower screwthreadedupon the barrel over the packing rings and hollowed into an annular cuparound the barrel below the said delivery apertures, substantiall y asdescribed.

3. In pump pistons, a hollow piston barrel having delivering aperturesat its sides near the upper end; packing rings upon the said barrel; afollower screw-threaded upon the barrel above the rings and cup-shapedat its upper end and having an annular recess over the screw-thread inthe cup, and a packing ring of soft material in the recess,substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

DAVID BOWLBY S'IEVENSON.

Witnesses:

ORA E. GILMORE, ARTHUR C. Pos'rLnWArr.

